N. Hiyainu Devi is an Indian entrepreneur and social worker who is known for being the wife of N. Biren Singh, the twelfth Chief Minister of Manipur.She grew up in a middle-class family in Bishnupur, Manipur.Hiyainu handles a Handloom and Handicraft business in Manipur.Hiyainu launched the Anaemia Free Manipur Poster Campaign under Bharat Vikas Parishad, Manipur, at Chief Ministers Secretariat in 2020. N. Hiyainu Devi at the launch of Anaemia-free Manipur Poster Campaign 2020.Subsequently, she inaugurated the Imphal WPC store. It was the fourth WPC centre by Hardy Smith in India, which aimed at promoting, and supplying eco-friendly WPC products in the country. N. Hiyainu Devi inaugurating Imphal WPC store.In 2021, the foundation stone of a Water Supply Scheme at Lamlongei Maning Leikai (Leihaopokpi), Imphal, was laid by Hiyainu under the Pradhan Mantri Jan Vikas Karyakram (PMJVK). It was implemented by MOBEDS Manipur.In 2018, Hiyainu, along with RK Meme Devi, DIG Crime Branch and Director of Fire Brigade, and Dr K Sobita Devi, former Director of Arts and Culture Department, was invited as a chief guest at the inauguration of the art gallery of the KAI group in Kangjabi Leirak, Imphal. It was the first time that she attended the inaugural function of the World Class Event management firm and the moment she entered the gallery, Hiyainu was enthralled to see her own portrait hanging among the aesthetically designed pieces of the KAI group. N. Hiyainu Devi at the inauguration of the KAI art gallery.Her daughter, Anjubala Nongthongbam, is married to R. K. Imo Singh, a politician. He is the son of Rajkumar Jaichandra Singh who became the first Union Minister from Manipur in the ministry of Rajiv Gandhi. N. Hiyainu Devi with her daughter and son-in-law.